Optical online monitoring system for lightning arrester

Abstract

The invention discloses a lightning arrester optical on-line monitoring system, which comprises a fiber grating temperature sensor and an F-P optical fiber leakage current sensor, the fiber grating temperature sensor and the F-P optical fiber leakage current sensor are both connected with an optical fiber demodulator, and the optical fiber demodulator is connected with a monitoring computer. The F-P optical fiber leakage current sensor and the optical fiber grating temperature sensor are used in a combined mode, on one hand, the utilization efficiency of demodulation equipment is improved, on the other hand, intrinsic passive measurement of an acquisition end is achieved, and the optical fiber digitization degree is improved.

Description

technical field [0001] The invention belongs to the technical field of substation lightning arrester monitoring and relates to an optical online monitoring system for lightning arresters. Background technique [0002] The zinc oxide arrester in the substation is mainly used in the power grid to limit the lightning overvoltage and operating overvoltage, and maintain the stable operation of the power equipment; although the performance of the material in the zinc oxide arrester is continuously improving, due to the long-term work under the power frequency voltage, at the same time Overvoltage often occurs and affected by external damp factors, the valve plate will gradually age, resulting in increased leakage current and continuous heat generation, eventually causing power grid accidents. [0003] During the construction of optical fiber digital substations, researchers have proposed an online monitoring device for lightning arresters with strong anti-interference ability, suc...

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Problems solved by technology

[0002] The zinc oxide arrester in the substation is mainly used in the power grid to limit the lightning overvoltage and operating overvoltage, and maintain the stable operation of the power equipment; although the performance of the material in the zinc oxide arrester is continuously improving, due to the long-term work under the power frequency voltage, at the same time Overvoltage often occurs and affected by external damp factors, the valve plate will gradually age, resulting in increased leakage current and continuous heat generation, eventually causing power grid accidents

[0003] During the construction of optical fiber digital substations, researchers have proposed an online monitoring device for lightning arresters with strong anti-interference ability, such as the invention patent CN104614602B "An online monitoring device for lightning arresters", although it is based on the principle of electromagnetic induction and optoelectronics, The on-line monitoring function of the zinc oxide arrester is realized by using the hybrid electronic Rogowski coil and the fiber grating temperature sensor. However, since the collection of the leakage current is always based on the principle of electromagnetic induction, it will still be interfered by various strong magnetic fields in the substation, even if it passes through After photoelectric conversion, optical fiber is used for signal transmission, which improves the measurement accuracy to a certain extent, but it is not essentially passive and cannot fully realize the requirements of optical fiber digitization

In addition, its fiber optic grating temperature sensor and hybrid electronic Rogowski coil are independent of each other, the degree of digitalization and intelligence of optical fiber needs to be improved, and there is a certain degree of waste of resources

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